Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
thieu khi » thieu nhi, tien khi, hieu chi
toc sach » hoc sach, doc sach, thuoc sach
nang hoc » nang doc, nang luc, dong hoc
nhung bo » nhung bi, nhung bai, nhung don
khi cua » chi cua, thai cua
bo o » bo ho, bo oc, bo so
o vi » co vi, so vi, o va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) nang hoc thieu khi cua ets : nhung bo o vi đai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) nang hoc thieu khi cua ets : nhung bo o vi đai".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) nang hoc thieu khi cua ets : nhung bo o vi đai*.